Boster's Western Blotting Filter Paper is pre-cut cotton fiber for wet or semi-dry, passive or electrophoretic transfer of proteins from polyacrylamide gels (SDS-PAGE) to PVDF, nitrocellulose, or other membranes. These filter papers are manufactured with ultrapure water and contain no additives that can interfere with any application. The smooth sheets are suitable for use with alcohol and other organic solvents involved in protein transfer and nucleic acid blotting. The papers also provide a uniform flow of buffer through the gel to the transfer membrance in a blotting sandwich.